Carren also worked with Carroll as writer and supervising producer on the television series Diagnosis Murder (1997-1999) and Martial Law (1999-2000). More recently, he co-wrote and produced the horror film Mr. Hell (2006, with Tracy Scoggins) on which he also had an acting part, worked as script editor and actor on the drama Mason-Dixon (2008), wrote, directed, executive produced and co-edited the thriller The Red Queen (2009), wrote for the television comedy show The Coxton Campaign (2011), and wrote the screenplay for the horror film Judge Ice (2012).